Shears



Jan. 1, 1935.' A. w. soDERBERG 1,986,685 l SHEARS FiledAug. s, 1953 s sheets-sham 1 VMM m Jan. 1, 1935.

A. W. SODERBERG SHEARS Filed Aug. 8, 1933 3 Sheets-Sheet 2 Innen/fof.'

,4A/DREW W. SOQEEBEQG, y f1/gab Jan. l, 1935. A- w SODER'BERG 1,986,685

SHEARS Filed Aug. 8, 1933 s sheets-sheet 3 [nuenfo:

#N0/@EW 5005655196,

' of the invention.

Patented l, 1935 UNITED s'rATEs PATENT OFFICE .....''ll'j 1 claim. (ci. 164-53) This invencin relates to improvements in Y shears, and more particularly to those devices used for the end and side shearing of metal plates and the like, although not limitedthereto.

In the process of end shearing of metal plates the rst cut removes the crop end. Whether the plate requires cropping only at each end or .is sheared in multiple lengths, it becomes necessary to reshear one end of eachplate, particularly if they are of substantial thickness, in order to rewhich contacted under the top knife of the shear 1 device. This deformation, or what is known in the mill as shear bow, causes a loss of from approximately one inch to three inches in scrap for each cut and entails a great amount of labor in handling. It is also obvious to those skilled in the art that compensations must be made for this scrap loss in producing the various sizes required in the finished article.. These conditions are also existent in side shearing operations.

'I'he overlapping of the stationary knife and the movable knife in the conventional design of gate shear is unavoidable, although'it is true that no shearing action takes place einer the cooperating edges of the knives pass each other.

, When shearing plates lengthwise in multiple widths in a side gate shear, "it becomes necessary to make due allowance for reshearing oneA edge of. each plate in order to remove the bow, causing a loss of material and additional labor.

One object of the present invention is the provision of a novel apparatus for shearing metal plates in such manner as to completely eliminate the bowing of the sheared edge, resulting in Aa. very substantial saving in scrap loss` and the labor incident to its handling.

y Another object is to provide novel means for producing a combined rolling or. rocking motion to the movable knife in such manner as to obviate the necessity of its progressing beyond the lcutting edge of the stationary knife.

A still further-object is to provi de a novel tension means to adjust the longitudinal travel of the movable shear blade and to return the same to adesired position at the end of each shearing cycle.

These and further objects will appear after referring to the drawings, in which:

Figure 1 is a front elevation ofthe apparatus Figure 2 is4 afragmentary plan, pa tion.

rtly in sec- 'is guided at the rear by lugs 20extending from ner as to balance the upper shear block through a spring 30, washer 31, and nut 32, for tensioning tions showing the elements of the apparatus in various stages of operation.

Referring more particularly to the drawings, the numeral 2 designates a` bed plate on which there is'mounted a housing 3 for the apparatus of the invention. The housing 3 carries a lower and stationary shear block 4, to which there is secured a conventional shear knife 5, and an upper cross-frame 6, in which there is journaled a pair of shafts 7 and 8.

The shafts 7 and 8 each have a gear secured thereto, as at 9 and 10, respectively, which is rotated by a common pinion 12. lThe pinion 12 is provided with a clutch device, generally indicatedat12, from which it receives rotation through ashaft 12b, that may be driven in any suitable manner. y

The shafts 7 and 8 carry cranks 14 and 15, respectively, which are disposed directly over the lower -shear block 4. The crank 14, which is given an'approximate lead or offset of 90 de- `grecs with respect to the crank 15, has a pitman 16 connected thereto. A similar pitman 17 is connected to the crank 15.

An upper and movable shear block 18 is supported by the pitmen 16 and 17, as at 16* and 17", respectively, and has secured thereto a shear knife 19 of curvedshape, representing preferably a true radius. The upper shear blade 19 the housing 3, andat the front by a cross-frame 21 which serves. in addition, as a support for a plurality of fluid operated cylinders 22, having associated therewith the usual shear holddowns 23.. A suitable source of uuid supply serves to actuate 4the hold-downs.

A uid cylinder '24 is mounted on the upper cross-frame 6,- and provided with a piston having a rod 25 to which there is connected `one of the ends of a pair of links 26. rThe other ends of the links 26 are secured as at ,26 tothe upper mid-portion of the upper shear block `18. A suitable source of uid supply is connected to the uid cylinder 24, and is controlled insuch man- 45 the links 26. A A guide rod 27 is connected at one of its ends 27* to one corner of the uppeflshear .block 18 and made to extend through an aperture 3'l in the housing 3, and a swivel cross-head 28 which is mounted in an ear 29. The end ofthe guide rod 27, which extends through and beyond the ear 29, is threaded as at 27'a and provided with the guide rod against movement through the swivel cross-head 28.

In operation, a plate, or the like, which is represented at A, is positioned beneath the holddowns 23 and the uid cylinders 22 operated to hold it in position between the shear knives 5 and 19. The gears 9 and 10 are made to rotate by means of the common pinion 12 and the clutch 12B on the driven shaft 12b.

'I'he rotation of the gear 9 will cause the crank 14 to move downwardly ahead of the crank 15, due to the fact that it has a degree lead or offset. This will cause the curved knife -19 to begin its cutting action at the edge of the plate A. The position of the various elements of the apparatus at this stage of the operation is shown in Figure 1.

'I'he knife 19 will be lowered until the lower dead-center of the pitman 16 is reached, at which time it will have cooperated with the stationary knife 5 in such manner as to have penetrated the plate for a short distance inwardly from its edge, as shown in Figure 3. During this stage of the operation the crank 15 will have caused the pitman 1'7 to have begun its descent. The lower dead-center of the crank 14 will not permit -the pitman 16 to cause the knife 19 to overlap the upper edge of the stationary knife 5, as shown in Figure'3. As the pitman 17 continues its descent, the pitman 16 will move vertically a very slight distance until the former is in a corresponding position, at which-time the mid-portion of the curved knife 19 will pene' trate the plate A, as shown inFigure 4.

The pitman 16 will next rise fairly rapidly, while the end of the knife 19y which is adjacent the descending pitman 17 will rock across the unsheared width ofthe plate and complete the shearing operation, as illustrated in Figure 5.

Due to the rocking action of the curved knife 19 and the fact that it does not overlap the stationary and cooperating knife 5, the plate A will be completely ,sheared with its severed edges occupying a plane.

While I have shown and described one specific embodiment of my invention, it will be understood that I do not| wish to be 'limited exactly thereto, since varios modifications may be made Without departing from the scopel of my invention, as defined in the following claim.

A heavy duty shear for shearing metal plates of substantial thickness comprising a housing, a stationary shear knife mounted on said housing, a pair of shafts journaled on said housing, a crank on one of said shafts, a crank on the other of said shafts being offset approximately 90 degrecs with respect to said first named crank, a pair of pitmen, each of which is connected at one of its ends to one of said cranks and at the other of its ends to a movable shear member, a curved knife mounted on said movable shear member, means for periodically rotating said pair of shafts, fluid means-for balancing said movable shear member, andvtension means for limiting the longitudinal movement of said movable shear "member, said cranks and pitmen being constructed and arranged to move said movable shear member and its curved knife in a path to effect a rolling cut in Aconjunction with said stationary shear knife and to limit the vertical movement of said shear member and prevent said curved knife overlapping the cutting edge of said stationary shear knife.

ANDREW W. SODERBERG'. 

